package com.itheima.service;

import com.alibaba.dubbo.config.annotation.Reference;
import com.itheima.pojo.Permission;
import com.itheima.pojo.Role;
import com.itheima.pojo.User;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Component;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;


@Component
public class SpringSecurityUserService implements UserDetailsService {
    //使用dubbo远程调用服务提供方来查询数据库
    @Reference
    private UserService userService;

    //根据用户名查询数据库获取用用户信息
    @Override
    //这个loadUserByUsername方法是框架帮我们调用的,不需要我们自己写什么servlet去调用
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userService.findByUsername(username);
        //因为用户他在登录页面乱输,所以我们必须要进行一下判断
        if (user == null) {//用户名不存在
            return null;
        }
        //为用户授权我们必须要用这个GrantedAuthority
        List<GrantedAuthority> list = new ArrayList<>();
        //拿到这个用户的角色
        Set<Role> roles = user.getRoles();
        for (Role role : roles) {
            //遍历角色集合，为用户授予角色
            list.add(new SimpleGrantedAuthority(role.getKeyword()));
            Set<Permission> permissions = role.getPermissions();
            for (Permission permission : permissions) {
                //遍历权限集合，为用户授权
                list.add(new SimpleGrantedAuthority(permission.getKeyword()));
            }
        }
        //这里密码已经是加密过后的密码了,所以我们不需要写{noop}了
        org.springframework.security.core.userdetails.User securityUser =
                new org.springframework.security.core.userdetails.User(username, user.getPassword(),list);
        return securityUser;
    }
}
